This book provides a scientific approach to coloring grey hair, starting with an overview of the biology and structure of grey and white hair, color theory, and the chemical processes involved in hair coloring. It then introduces a new theoretical approach and discusses its methodological implications for using hair color on grey and white hair, followed by specific methods for formulating hair color to achieve desired results. The book aims to empower readers, particularly cosmetologists and DIY enthusiasts, to confidently and successfully formulate hair color for grey and white hair

Eva Maria Portillo holds two university degrees, is a College Professor, and mother. Eva is currently a Hairstylist Educator and Colour Consultant in Toronto, Ontario , Canada.